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Angular - the routing library
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import { ɵRuntimeError as RuntimeError } from '@angular/core';
import { from, of } from 'rxjs';
import { catchError, concatMap, defaultIfEmpty, first, last, map, mergeMap, scan, switchMap, tap, } from 'rxjs/operators';
import { AbsoluteRedirect, ApplyRedirects, canLoadFails, noMatch, NoMatch } from './apply_redirects';
import { createUrlTreeFromSnapshot } from './create_url_tree';
import { runCanLoadGuards } from './operators/check_guards';
import { ActivatedRouteSnapshot, getInherited, RouterStateSnapshot, } from './router_state';
import { PRIMARY_OUTLET } from './shared';
import { getOutlet, sortByMatchingOutlets } from './utils/config';
import { isImmediateMatch, match, matchWithChecks, noLeftoversInUrl, split, } from './utils/config_matching';
import { TreeNode } from './utils/tree';
import { isEmptyError } from './utils/type_guards';
/**
* Class used to indicate there were no additional route config matches but that all segments of
* the URL were consumed during matching so the route was URL matched. When this happens, we still
* try to match child configs in case there are empty path children.
*/
class NoLeftoversInUrl {
}
export function recognize(injector, configLoader, rootComponentType, config, urlTree, urlSerializer, paramsInheritanceStrategy = 'emptyOnly') {
return new Recognizer(injector, configLoader, rootComponentType, config, urlTree, paramsInheritanceStrategy, urlSerializer).recognize();
}
const MAX_ALLOWED_REDIRECTS = 31;
export class Recognizer {
constructor(injector, configLoader, rootComponentType, config, urlTree, paramsInheritanceStrategy, urlSerializer) {
this.injector = injector;
this.configLoader = configLoader;
this.rootComponentType = rootComponentType;
this.config = config;
this.urlTree = urlTree;
this.paramsInheritanceStrategy = paramsInheritanceStrategy;
this.urlSerializer = urlSerializer;
this.applyRedirects = new ApplyRedirects(this.urlSerializer, this.urlTree);
this.absoluteRedirectCount = 0;
this.allowRedirects = true;
}
noMatchError(e) {
return new RuntimeError(4002 /* RuntimeErrorCode.NO_MATCH */, typeof ngDevMode === 'undefined' || ngDevMode
? `Cannot match any routes. URL Segment: '${e.segmentGroup}'`
: `'${e.segmentGroup}'`);
}
recognize() {
const rootSegmentGroup = split(this.urlTree.root, [], [], this.config).segmentGroup;
return this.match(rootSegmentGroup).pipe(map(({ children, rootSnapshot }) => {
const rootNode = new TreeNode(rootSnapshot, children);
const routeState = new RouterStateSnapshot('', rootNode);
const tree = createUrlTreeFromSnapshot(rootSnapshot, [], this.urlTree.queryParams, this.urlTree.fragment);
// https://github.com/angular/angular/issues/47307
// Creating the tree stringifies the query params
// We don't want to do this here so reassign them to the original.
tree.queryParams = this.urlTree.queryParams;
routeState.url = this.urlSerializer.serialize(tree);
return { state: routeState, tree };
}));
}
match(rootSegmentGroup) {
// Use Object.freeze to prevent readers of the Router state from modifying it outside
// of a navigation, resulting in the router being out of sync with the browser.
const rootSnapshot = new ActivatedRouteSnapshot([], Object.freeze({}), Object.freeze({ ...this.urlTree.queryParams }), this.urlTree.fragment, Object.freeze({}), PRIMARY_OUTLET, this.rootComponentType, null, {});
return this.processSegmentGroup(this.injector, this.config, rootSegmentGroup, PRIMARY_OUTLET, rootSnapshot).pipe(map((children) => {
return { children, rootSnapshot };
}), catchError((e) => {
if (e instanceof AbsoluteRedirect) {
this.urlTree = e.urlTree;
return this.match(e.urlTree.root);
}
if (e instanceof NoMatch) {
throw this.noMatchError(e);
}
throw e;
}));
}
processSegmentGroup(injector, config, segmentGroup, outlet, parentRoute) {
if (segmentGroup.segments.length === 0 && segmentGroup.hasChildren()) {
return this.processChildren(injector, config, segmentGroup, parentRoute);
}
return this.processSegment(injector, config, segmentGroup, segmentGroup.segments, outlet, true, parentRoute).pipe(map((child) => (child instanceof TreeNode ? [child] : [])));
}
/**
* Matches every child outlet in the `segmentGroup` to a `Route` in the config. Returns `null` if
* we cannot find a match for _any_ of the children.
*
* @param config - The `Routes` to match against
* @param segmentGroup - The `UrlSegmentGroup` whose children need to be matched against the
* config.
*/
processChildren(injector, config, segmentGroup, parentRoute) {
// Expand outlets one at a time, starting with the primary outlet. We need to do it this way
// because an absolute redirect from the primary outlet takes precedence.
const childOutlets = [];
for (const child of Object.keys(segmentGroup.children)) {
if (child === 'primary') {
childOutlets.unshift(child);
}
else {
childOutlets.push(child);
}
}
return from(childOutlets).pipe(concatMap((childOutlet) => {
const child = segmentGroup.children[childOutlet];
// Sort the config so that routes with outlets that match the one being activated
// appear first, followed by routes for other outlets, which might match if they have
// an empty path.
const sortedConfig = sortByMatchingOutlets(config, childOutlet);
return this.processSegmentGroup(injector, sortedConfig, child, childOutlet, parentRoute);
}), scan((children, outletChildren) => {
children.push(...outletChildren);
return children;
}), defaultIfEmpty(null), last(), mergeMap((children) => {
if (children === null)
return noMatch(segmentGroup);
// Because we may have matched two outlets to the same empty path segment, we can have
// multiple activated results for the same outlet. We should merge the children of
// these results so the final return value is only one `TreeNode` per outlet.
const mergedChildren = mergeEmptyPathMatches(children);
if (typeof ngDevMode === 'undefined' || ngDevMode) {
// This should really never happen - we are only taking the first match for each
// outlet and merge the empty path matches.
checkOutletNameUniqueness(mergedChildren);
}
sortActivatedRouteSnapshots(mergedChildren);
return of(mergedChildren);
}));
}
processSegment(injector, routes, segmentGroup, segments, outlet, allowRedirects, parentRoute) {
return from(routes).pipe(concatMap((r) => {
return this.processSegmentAgainstRoute(r._injector ?? injector, routes, r, segmentGroup, segments, outlet, allowRedirects, parentRoute).pipe(catchError((e) => {
if (e instanceof NoMatch) {
return of(null);
}
throw e;
}));
}), first((x) => !!x), catchError((e) => {
if (isEmptyError(e)) {
if (noLeftoversInUrl(segmentGroup, segments, outlet)) {
return of(new NoLeftoversInUrl());
}
return noMatch(segmentGroup);
}
throw e;
}));
}
processSegmentAgainstRoute(injector, routes, route, rawSegment, segments, outlet, allowRedirects, parentRoute) {
if (!isImmediateMatch(route, rawSegment, segments, outlet))
return noMatch(rawSegment);
if (route.redirectTo === undefined) {
return this.matchSegmentAgainstRoute(injector, rawSegment, route, segments, outlet, parentRoute);
}
if (this.allowRedirects && allowRedirects) {
return this.expandSegmentAgainstRouteUsingRedirect(injector, rawSegment, routes, route, segments, outlet, parentRoute);
}
return noMatch(rawSegment);
}
expandSegmentAgainstRouteUsingRedirect(injector, segmentGroup, routes, route, segments, outlet, parentRoute) {
const { matched, parameters, consumedSegments, positionalParamSegments, remainingSegments } = match(segmentGroup, route, segments);
if (!matched)
return noMatch(segmentGroup);
// TODO(atscott): Move all of this under an if(ngDevMode) as a breaking change and allow stack
// size exceeded in production
if (typeof route.redirectTo === 'string' && route.redirectTo[0] === '/') {
this.absoluteRedirectCount++;
if (this.absoluteRedirectCount > MAX_ALLOWED_REDIRECTS) {
if (ngDevMode) {
throw new RuntimeError(4016 /* RuntimeErrorCode.INFINITE_REDIRECT */, `Detected possible infinite redirect when redirecting from '${this.urlTree}' to '${route.redirectTo}'.\n` +
`This is currently a dev mode only error but will become a` +
` call stack size exceeded error in production in a future major version.`);
}
this.allowRedirects = false;
}
}
const currentSnapshot = new ActivatedRouteSnapshot(segments, parameters, Object.freeze({ ...this.urlTree.queryParams }), this.urlTree.fragment, getData(route), getOutlet(route), route.component ?? route._loadedComponent ?? null, route, getResolve(route));
const inherited = getInherited(currentSnapshot, parentRoute, this.paramsInheritanceStrategy);
currentSnapshot.params = Object.freeze(inherited.params);
currentSnapshot.data = Object.freeze(inherited.data);
const newTree = this.applyRedirects.applyRedirectCommands(consumedSegments, route.redirectTo, positionalParamSegments, currentSnapshot, injector);
return this.applyRedirects.lineralizeSegments(route, newTree).pipe(mergeMap((newSegments) => {
return this.processSegment(injector, routes, segmentGroup, newSegments.concat(remainingSegments), outlet, false, parentRoute);
}));
}
matchSegmentAgainstRoute(injector, rawSegment, route, segments, outlet, parentRoute) {
const matchResult = matchWithChecks(rawSegment, route, segments, injector, this.urlSerializer);
if (route.path === '**') {
// Prior versions of the route matching algorithm would stop matching at the wildcard route.
// We should investigate a better strategy for any existing children. Otherwise, these
// child segments are silently dropped from the navigation.
// https://github.com/angular/angular/issues/40089
rawSegment.children = {};
}
return matchResult.pipe(switchMap((result) => {
if (!result.matched) {
return noMatch(rawSegment);
}
// If the route has an injector created from providers, we should start using that.
injector = route._injector ?? injector;
return this.getChildConfig(injector, route, segments).pipe(switchMap(({ routes: childConfig }) => {
const childInjector = route._loadedInjector ?? injector;
const { parameters, consumedSegments, remainingSegments } = result;
const snapshot = new ActivatedRouteSnapshot(consumedSegments, parameters, Object.freeze({ ...this.urlTree.queryParams }), this.urlTree.fragment, getData(route), getOutlet(route), route.component ?? route._loadedComponent ?? null, route, getResolve(route));
const inherited = getInherited(snapshot, parentRoute, this.paramsInheritanceStrategy);
snapshot.params = Object.freeze(inherited.params);
snapshot.data = Object.freeze(inherited.data);
const { segmentGroup, slicedSegments } = split(rawSegment, consumedSegments, remainingSegments, childConfig);
if (slicedSegments.length === 0 && segmentGroup.hasChildren()) {
return this.processChildren(childInjector, childConfig, segmentGroup, snapshot).pipe(map((children) => {
return new TreeNode(snapshot, children);
}));
}
if (childConfig.length === 0 && slicedSegments.length === 0) {
return of(new TreeNode(snapshot, []));
}
const matchedOnOutlet = getOutlet(route) === outlet;
// If we matched a config due to empty path match on a different outlet, we need to
// continue passing the current outlet for the segment rather than switch to PRIMARY.
// Note that we switch to primary when we have a match because outlet configs look like
// this: {path: 'a', outlet: 'a', children: [
// {path: 'b', component: B},
// {path: 'c', component: C},
// ]}
// Notice that the children of the named outlet are configured with the primary outlet
return this.processSegment(childInjector, childConfig, segmentGroup, slicedSegments, matchedOnOutlet ? PRIMARY_OUTLET : outlet, true, snapshot).pipe(map((child) => {
return new TreeNode(snapshot, child instanceof TreeNode ? [child] : []);
}));
}));
}));
}
getChildConfig(injector, route, segments) {
if (route.children) {
// The children belong to the same module
return of({ routes: route.children, injector });
}
if (route.loadChildren) {
// lazy children belong to the loaded module
if (route._loadedRoutes !== undefined) {
return of({ routes: route._loadedRoutes, injector: route._loadedInjector });
}
return runCanLoadGuards(injector, route, segments, this.urlSerializer).pipe(mergeMap((shouldLoadResult) => {
if (shouldLoadResult) {
return this.configLoader.loadChildren(injector, route).pipe(tap((cfg) => {
route._loadedRoutes = cfg.routes;
route._loadedInjector = cfg.injector;
}));
}
return canLoadFails(route);
}));
}
return of({ routes: [], injector });
}
}
function sortActivatedRouteSnapshots(nodes) {
nodes.sort((a, b) => {
if (a.value.outlet === PRIMARY_OUTLET)
return -1;
if (b.value.outlet === PRIMARY_OUTLET)
return 1;
return a.value.outlet.localeCompare(b.value.outlet);
});
}
function hasEmptyPathConfig(node) {
const config = node.value.routeConfig;
return config && config.path === '';
}
/**
* Finds `TreeNode`s with matching empty path route configs and merges them into `TreeNode` with
* the children from each duplicate. This is necessary because different outlets can match a
* single empty path route config and the results need to then be merged.
*/
function mergeEmptyPathMatches(nodes) {
const result = [];
// The set of nodes which contain children that were merged from two duplicate empty path nodes.
const mergedNodes = new Set();
for (const node of nodes) {
if (!hasEmptyPathConfig(node)) {
result.push(node);
continue;
}
const duplicateEmptyPathNode = result.find((resultNode) => node.value.routeConfig === resultNode.value.routeConfig);
if (duplicateEmptyPathNode !== undefined) {
duplicateEmptyPathNode.children.push(...node.children);
mergedNodes.add(duplicateEmptyPathNode);
}
else {
result.push(node);
}
}
// For each node which has children from multiple sources, we need to recompute a new `TreeNode`
// by also merging those children. This is necessary when there are multiple empty path configs
// in a row. Put another way: whenever we combine children of two nodes, we need to also check
// if any of those children can be combined into a single node as well.
for (const mergedNode of mergedNodes) {
const mergedChildren = mergeEmptyPathMatches(mergedNode.children);
result.push(new TreeNode(mergedNode.value, mergedChildren));
}
return result.filter((n) => !mergedNodes.has(n));
}
function checkOutletNameUniqueness(nodes) {
const names = {};
nodes.forEach((n) => {
const routeWithSameOutletName = names[n.value.outlet];
if (routeWithSameOutletName) {
const p = routeWithSameOutletName.url.map((s) => s.toString()).join('/');
const c = n.value.url.map((s) => s.toString()).join('/');
throw new RuntimeError(4006 /* RuntimeErrorCode.TWO_SEGMENTS_WITH_SAME_OUTLET */, (typeof ngDevMode === 'undefined' || ngDevMode) &&
`Two segments cannot have the same outlet name: '${p}' and '${c}'.`);
}
names[n.value.outlet] = n.value;
});
}
function getData(route) {
return route.data || {};
}
function getResolve(route) {
return route.resolve || {};
}
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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {EnvironmentInjector, Type, ɵRuntimeError as RuntimeError} from '@angular/core';\nimport {from, Observable, of} from 'rxjs';\nimport {\n  catchError,\n  concatMap,\n  defaultIfEmpty,\n  first,\n  last,\n  map,\n  mergeMap,\n  scan,\n  switchMap,\n  tap,\n} from 'rxjs/operators';\n\nimport {AbsoluteRedirect, ApplyRedirects, canLoadFails, noMatch, NoMatch} from './apply_redirects';\nimport {createUrlTreeFromSnapshot} from './create_url_tree';\nimport {RuntimeErrorCode} from './errors';\nimport {Data, LoadedRouterConfig, ResolveData, Route, Routes} from './models';\nimport {runCanLoadGuards} from './operators/check_guards';\nimport {RouterConfigLoader} from './router_config_loader';\nimport {\n  ActivatedRouteSnapshot,\n  getInherited,\n  ParamsInheritanceStrategy,\n  RouterStateSnapshot,\n} from './router_state';\nimport {PRIMARY_OUTLET} from './shared';\nimport {UrlSegment, UrlSegmentGroup, UrlSerializer, UrlTree} from './url_tree';\nimport {getOutlet, sortByMatchingOutlets} from './utils/config';\nimport {\n  isImmediateMatch,\n  match,\n  matchWithChecks,\n  noLeftoversInUrl,\n  split,\n} from './utils/config_matching';\nimport {TreeNode} from './utils/tree';\nimport {isEmptyError} from './utils/type_guards';\n\n/**\n * Class used to indicate there were no additional route config matches but that all segments of\n * the URL were consumed during matching so the route was URL matched. When this happens, we still\n * try to match child configs in case there are empty path children.\n */\nclass NoLeftoversInUrl {}\n\nexport function recognize(\n  injector: EnvironmentInjector,\n  configLoader: RouterConfigLoader,\n  rootComponentType: Type<any> | null,\n  config: Routes,\n  urlTree: UrlTree,\n  urlSerializer: UrlSerializer,\n  paramsInheritanceStrategy: ParamsInheritanceStrategy = 'emptyOnly',\n): Observable<{state: RouterStateSnapshot; tree: UrlTree}> {\n  return new Recognizer(\n    injector,\n    configLoader,\n    rootComponentType,\n    config,\n    urlTree,\n    paramsInheritanceStrategy,\n    urlSerializer,\n  ).recognize();\n}\n\nconst MAX_ALLOWED_REDIRECTS = 31;\n\nexport class Recognizer {\n  private applyRedirects = new ApplyRedirects(this.urlSerializer, this.urlTree);\n  private absoluteRedirectCount = 0;\n  allowRedirects = true;\n\n  constructor(\n    private injector: EnvironmentInjector,\n    private configLoader: RouterConfigLoader,\n    private rootComponentType: Type<any> | null,\n    private config: Routes,\n    private urlTree: UrlTree,\n    private paramsInheritanceStrategy: ParamsInheritanceStrategy,\n    private readonly urlSerializer: UrlSerializer,\n  ) {}\n\n  private noMatchError(e: NoMatch): RuntimeError<RuntimeErrorCode.NO_MATCH> {\n    return new RuntimeError(\n      RuntimeErrorCode.NO_MATCH,\n      typeof ngDevMode === 'undefined' || ngDevMode\n        ? `Cannot match any routes. URL Segment: '${e.segmentGroup}'`\n        : `'${e.segmentGroup}'`,\n    );\n  }\n\n  recognize(): Observable<{state: RouterStateSnapshot; tree: UrlTree}> {\n    const rootSegmentGroup = split(this.urlTree.root, [], [], this.config).segmentGroup;\n\n    return this.match(rootSegmentGroup).pipe(\n      map(({children, rootSnapshot}) => {\n        const rootNode = new TreeNode(rootSnapshot, children);\n        const routeState = new RouterStateSnapshot('', rootNode);\n        const tree = createUrlTreeFromSnapshot(\n          rootSnapshot,\n          [],\n          this.urlTree.queryParams,\n          this.urlTree.fragment,\n        );\n        // https://github.com/angular/angular/issues/47307\n        // Creating the tree stringifies the query params\n        // We don't want to do this here so reassign them to the original.\n        tree.queryParams = this.urlTree.queryParams;\n        routeState.url = this.urlSerializer.serialize(tree);\n        return {state: routeState, tree};\n      }),\n    );\n  }\n\n  private match(rootSegmentGroup: UrlSegmentGroup): Observable<{\n    children: TreeNode<ActivatedRouteSnapshot>[];\n    rootSnapshot: ActivatedRouteSnapshot;\n  }> {\n    // Use Object.freeze to prevent readers of the Router state from modifying it outside\n    // of a navigation, resulting in the router being out of sync with the browser.\n    const rootSnapshot = new ActivatedRouteSnapshot(\n      [],\n      Object.freeze({}),\n      Object.freeze({...this.urlTree.queryParams}),\n      this.urlTree.fragment,\n      Object.freeze({}),\n      PRIMARY_OUTLET,\n      this.rootComponentType,\n      null,\n      {},\n    );\n    return this.processSegmentGroup(\n      this.injector,\n      this.config,\n      rootSegmentGroup,\n      PRIMARY_OUTLET,\n      rootSnapshot,\n    ).pipe(\n      map((children) => {\n        return {children, rootSnapshot};\n      }),\n      catchError((e: any) => {\n        if (e instanceof AbsoluteRedirect) {\n          this.urlTree = e.urlTree;\n          return this.match(e.urlTree.root);\n        }\n        if (e instanceof NoMatch) {\n          throw this.noMatchError(e);\n        }\n\n        throw e;\n      }),\n    );\n  }\n\n  processSegmentGroup(\n    injector: EnvironmentInjector,\n    config: Route[],\n    segmentGroup: UrlSegmentGroup,\n    outlet: string,\n    parentRoute: ActivatedRouteSnapshot,\n  ): Observable<TreeNode<ActivatedRouteSnapshot>[]> {\n    if (segmentGroup.segments.length === 0 && segmentGroup.hasChildren()) {\n      return this.processChildren(injector, config, segmentGroup, parentRoute);\n    }\n\n    return this.processSegment(\n      injector,\n      config,\n      segmentGroup,\n      segmentGroup.segments,\n      outlet,\n      true,\n      parentRoute,\n    ).pipe(map((child) => (child instanceof TreeNode ? [child] : [])));\n  }\n\n  /**\n   * Matches every child outlet in the `segmentGroup` to a `Route` in the config. Returns `null` if\n   * we cannot find a match for _any_ of the children.\n   *\n   * @param config - The `Routes` to match against\n   * @param segmentGroup - The `UrlSegmentGroup` whose children need to be matched against the\n   *     config.\n   */\n  processChildren(\n    injector: EnvironmentInjector,\n    config: Route[],\n    segmentGroup: UrlSegmentGroup,\n    parentRoute: ActivatedRouteSnapshot,\n  ): Observable<TreeNode<ActivatedRouteSnapshot>[]> {\n    // Expand outlets one at a time, starting with the primary outlet. We need to do it this way\n    // because an absolute redirect from the primary outlet takes precedence.\n    const childOutlets: string[] = [];\n    for (const child of Object.keys(segmentGroup.children)) {\n      if (child === 'primary') {\n        childOutlets.unshift(child);\n      } else {\n        childOutlets.push(child);\n      }\n    }\n    return from(childOutlets).pipe(\n      concatMap((childOutlet) => {\n        const child = segmentGroup.children[childOutlet];\n        // Sort the config so that routes with outlets that match the one being activated\n        // appear first, followed by routes for other outlets, which might match if they have\n        // an empty path.\n        const sortedConfig = sortByMatchingOutlets(config, childOutlet);\n        return this.processSegmentGroup(injector, sortedConfig, child, childOutlet, parentRoute);\n      }),\n      scan((children, outletChildren) => {\n        children.push(...outletChildren);\n        return children;\n      }),\n      defaultIfEmpty(null as TreeNode<ActivatedRouteSnapshot>[] | null),\n      last(),\n      mergeMap((children) => {\n        if (children === null) return noMatch(segmentGroup);\n        // Because we may have matched two outlets to the same empty path segment, we can have\n        // multiple activated results for the same outlet. We should merge the children of\n        // these results so the final return value is only one `TreeNode` per outlet.\n        const mergedChildren = mergeEmptyPathMatches(children);\n        if (typeof ngDevMode === 'undefined' || ngDevMode) {\n          // This should really never happen - we are only taking the first match for each\n          // outlet and merge the empty path matches.\n          checkOutletNameUniqueness(mergedChildren);\n        }\n        sortActivatedRouteSnapshots(mergedChildren);\n        return of(mergedChildren);\n      }),\n    );\n  }\n\n  processSegment(\n    injector: EnvironmentInjector,\n    routes: Route[],\n    segmentGroup: UrlSegmentGroup,\n    segments: UrlSegment[],\n    outlet: string,\n    allowRedirects: boolean,\n    parentRoute: ActivatedRouteSnapshot,\n  ): Observable<TreeNode<ActivatedRouteSnapshot> | NoLeftoversInUrl> {\n    return from(routes).pipe(\n      concatMap((r) => {\n        return this.processSegmentAgainstRoute(\n          r._injector ?? injector,\n          routes,\n          r,\n          segmentGroup,\n          segments,\n          outlet,\n          allowRedirects,\n          parentRoute,\n        ).pipe(\n          catchError((e: any) => {\n            if (e instanceof NoMatch) {\n              return of(null);\n            }\n            throw e;\n          }),\n        );\n      }),\n      first((x): x is TreeNode<ActivatedRouteSnapshot> | NoLeftoversInUrl => !!x),\n      catchError((e) => {\n        if (isEmptyError(e)) {\n          if (noLeftoversInUrl(segmentGroup, segments, outlet)) {\n            return of(new NoLeftoversInUrl());\n          }\n          return noMatch(segmentGroup);\n        }\n        throw e;\n      }),\n    );\n  }\n\n  processSegmentAgainstRoute(\n    injector: EnvironmentInjector,\n    routes: Route[],\n    route: Route,\n    rawSegment: UrlSegmentGroup,\n    segments: UrlSegment[],\n    outlet: string,\n    allowRedirects: boolean,\n    parentRoute: ActivatedRouteSnapshot,\n  ): Observable<TreeNode<ActivatedRouteSnapshot> | NoLeftoversInUrl> {\n    if (!isImmediateMatch(route, rawSegment, segments, outlet)) return noMatch(rawSegment);\n\n    if (route.redirectTo === undefined) {\n      return this.matchSegmentAgainstRoute(\n        injector,\n        rawSegment,\n        route,\n        segments,\n        outlet,\n        parentRoute,\n      );\n    }\n\n    if (this.allowRedirects && allowRedirects) {\n      return this.expandSegmentAgainstRouteUsingRedirect(\n        injector,\n        rawSegment,\n        routes,\n        route,\n        segments,\n        outlet,\n        parentRoute,\n      );\n    }\n\n    return noMatch(rawSegment);\n  }\n\n  private expandSegmentAgainstRouteUsingRedirect(\n    injector: EnvironmentInjector,\n    segmentGroup: UrlSegmentGroup,\n    routes: Route[],\n    route: Route,\n    segments: UrlSegment[],\n    outlet: string,\n    parentRoute: ActivatedRouteSnapshot,\n  ): Observable<TreeNode<ActivatedRouteSnapshot> | NoLeftoversInUrl> {\n    const {matched, parameters, consumedSegments, positionalParamSegments, remainingSegments} =\n      match(segmentGroup, route, segments);\n    if (!matched) return noMatch(segmentGroup);\n\n    // TODO(atscott): Move all of this under an if(ngDevMode) as a breaking change and allow stack\n    // size exceeded in production\n    if (typeof route.redirectTo === 'string' && route.redirectTo[0] === '/') {\n      this.absoluteRedirectCount++;\n      if (this.absoluteRedirectCount > MAX_ALLOWED_REDIRECTS) {\n        if (ngDevMode) {\n          throw new RuntimeError(\n            RuntimeErrorCode.INFINITE_REDIRECT,\n            `Detected possible infinite redirect when redirecting from '${this.urlTree}' to '${route.redirectTo}'.\\n` +\n              `This is currently a dev mode only error but will become a` +\n              ` call stack size exceeded error in production in a future major version.`,\n          );\n        }\n        this.allowRedirects = false;\n      }\n    }\n    const currentSnapshot = new ActivatedRouteSnapshot(\n      segments,\n      parameters,\n      Object.freeze({...this.urlTree.queryParams}),\n      this.urlTree.fragment,\n      getData(route),\n      getOutlet(route),\n      route.component ?? route._loadedComponent ?? null,\n      route,\n      getResolve(route),\n    );\n    const inherited = getInherited(currentSnapshot, parentRoute, this.paramsInheritanceStrategy);\n    currentSnapshot.params = Object.freeze(inherited.params);\n    currentSnapshot.data = Object.freeze(inherited.data);\n    const newTree = this.applyRedirects.applyRedirectCommands(\n      consumedSegments,\n      route.redirectTo!,\n      positionalParamSegments,\n      currentSnapshot,\n      injector,\n    );\n\n    return this.applyRedirects.lineralizeSegments(route, newTree).pipe(\n      mergeMap((newSegments: UrlSegment[]) => {\n        return this.processSegment(\n          injector,\n          routes,\n          segmentGroup,\n          newSegments.concat(remainingSegments),\n          outlet,\n          false,\n          parentRoute,\n        );\n      }),\n    );\n  }\n\n  matchSegmentAgainstRoute(\n    injector: EnvironmentInjector,\n    rawSegment: UrlSegmentGroup,\n    route: Route,\n    segments: UrlSegment[],\n    outlet: string,\n    parentRoute: ActivatedRouteSnapshot,\n  ): Observable<TreeNode<ActivatedRouteSnapshot>> {\n    const matchResult = matchWithChecks(rawSegment, route, segments, injector, this.urlSerializer);\n    if (route.path === '**') {\n      // Prior versions of the route matching algorithm would stop matching at the wildcard route.\n      // We should investigate a better strategy for any existing children. Otherwise, these\n      // child segments are silently dropped from the navigation.\n      // https://github.com/angular/angular/issues/40089\n      rawSegment.children = {};\n    }\n\n    return matchResult.pipe(\n      switchMap((result) => {\n        if (!result.matched) {\n          return noMatch(rawSegment);\n        }\n        // If the route has an injector created from providers, we should start using that.\n        injector = route._injector ?? injector;\n        return this.getChildConfig(injector, route, segments).pipe(\n          switchMap(({routes: childConfig}) => {\n            const childInjector = route._loadedInjector ?? injector;\n\n            const {parameters, consumedSegments, remainingSegments} = result;\n            const snapshot = new ActivatedRouteSnapshot(\n              consumedSegments,\n              parameters,\n              Object.freeze({...this.urlTree.queryParams}),\n              this.urlTree.fragment,\n              getData(route),\n              getOutlet(route),\n              route.component ?? route._loadedComponent ?? null,\n              route,\n              getResolve(route),\n            );\n            const inherited = getInherited(snapshot, parentRoute, this.paramsInheritanceStrategy);\n            snapshot.params = Object.freeze(inherited.params);\n            snapshot.data = Object.freeze(inherited.data);\n\n            const {segmentGroup, slicedSegments} = split(\n              rawSegment,\n              consumedSegments,\n              remainingSegments,\n              childConfig,\n            );\n\n            if (slicedSegments.length === 0 && segmentGroup.hasChildren()) {\n              return this.processChildren(childInjector, childConfig, segmentGroup, snapshot).pipe(\n                map((children) => {\n                  return new TreeNode(snapshot, children);\n                }),\n              );\n            }\n\n            if (childConfig.length === 0 && slicedSegments.length === 0) {\n              return of(new TreeNode(snapshot, []));\n            }\n\n            const matchedOnOutlet = getOutlet(route) === outlet;\n            // If we matched a config due to empty path match on a different outlet, we need to\n            // continue passing the current outlet for the segment rather than switch to PRIMARY.\n            // Note that we switch to primary when we have a match because outlet configs look like\n            // this: {path: 'a', outlet: 'a', children: [\n            //  {path: 'b', component: B},\n            //  {path: 'c', component: C},\n            // ]}\n            // Notice that the children of the named outlet are configured with the primary outlet\n            return this.processSegment(\n              childInjector,\n              childConfig,\n              segmentGroup,\n              slicedSegments,\n              matchedOnOutlet ? PRIMARY_OUTLET : outlet,\n              true,\n              snapshot,\n            ).pipe(\n              map((child) => {\n                return new TreeNode(snapshot, child instanceof TreeNode ? [child] : []);\n              }),\n            );\n          }),\n        );\n      }),\n    );\n  }\n  private getChildConfig(\n    injector: EnvironmentInjector,\n    route: Route,\n    segments: UrlSegment[],\n  ): Observable<LoadedRouterConfig> {\n    if (route.children) {\n      // The children belong to the same module\n      return of({routes: route.children, injector});\n    }\n\n    if (route.loadChildren) {\n      // lazy children belong to the loaded module\n      if (route._loadedRoutes !== undefined) {\n        return of({routes: route._loadedRoutes, injector: route._loadedInjector});\n      }\n\n      return runCanLoadGuards(injector, route, segments, this.urlSerializer).pipe(\n        mergeMap((shouldLoadResult: boolean) => {\n          if (shouldLoadResult) {\n            return this.configLoader.loadChildren(injector, route).pipe(\n              tap((cfg: LoadedRouterConfig) => {\n                route._loadedRoutes = cfg.routes;\n                route._loadedInjector = cfg.injector;\n              }),\n            );\n          }\n          return canLoadFails(route);\n        }),\n      );\n    }\n\n    return of({routes: [], injector});\n  }\n}\n\nfunction sortActivatedRouteSnapshots(nodes: TreeNode<ActivatedRouteSnapshot>[]): void {\n  nodes.sort((a, b) => {\n    if (a.value.outlet === PRIMARY_OUTLET) return -1;\n    if (b.value.outlet === PRIMARY_OUTLET) return 1;\n    return a.value.outlet.localeCompare(b.value.outlet);\n  });\n}\n\nfunction hasEmptyPathConfig(node: TreeNode<ActivatedRouteSnapshot>) {\n  const config = node.value.routeConfig;\n  return config && config.path === '';\n}\n\n/**\n * Finds `TreeNode`s with matching empty path route configs and merges them into `TreeNode` with\n * the children from each duplicate. This is necessary because different outlets can match a\n * single empty path route config and the results need to then be merged.\n */\nfunction mergeEmptyPathMatches(\n  nodes: Array<TreeNode<ActivatedRouteSnapshot>>,\n): Array<TreeNode<ActivatedRouteSnapshot>> {\n  const result: Array<TreeNode<ActivatedRouteSnapshot>> = [];\n  // The set of nodes which contain children that were merged from two duplicate empty path nodes.\n  const mergedNodes: Set<TreeNode<ActivatedRouteSnapshot>> = new Set();\n\n  for (const node of nodes) {\n    if (!hasEmptyPathConfig(node)) {\n      result.push(node);\n      continue;\n    }\n\n    const duplicateEmptyPathNode = result.find(\n      (resultNode) => node.value.routeConfig === resultNode.value.routeConfig,\n    );\n    if (duplicateEmptyPathNode !== undefined) {\n      duplicateEmptyPathNode.children.push(...node.children);\n      mergedNodes.add(duplicateEmptyPathNode);\n    } else {\n      result.push(node);\n    }\n  }\n  // For each node which has children from multiple sources, we need to recompute a new `TreeNode`\n  // by also merging those children. This is necessary when there are multiple empty path configs\n  // in a row. Put another way: whenever we combine children of two nodes, we need to also check\n  // if any of those children can be combined into a single node as well.\n  for (const mergedNode of mergedNodes) {\n    const mergedChildren = mergeEmptyPathMatches(mergedNode.children);\n    result.push(new TreeNode(mergedNode.value, mergedChildren));\n  }\n  return result.filter((n) => !mergedNodes.has(n));\n}\n\nfunction checkOutletNameUniqueness(nodes: TreeNode<ActivatedRouteSnapshot>[]): void {\n  const names: {[k: string]: ActivatedRouteSnapshot} = {};\n  nodes.forEach((n) => {\n    const routeWithSameOutletName = names[n.value.outlet];\n    if (routeWithSameOutletName) {\n      const p = routeWithSameOutletName.url.map((s) => s.toString()).join('/');\n      const c = n.value.url.map((s) => s.toString()).join('/');\n      throw new RuntimeError(\n        RuntimeErrorCode.TWO_SEGMENTS_WITH_SAME_OUTLET,\n        (typeof ngDevMode === 'undefined' || ngDevMode) &&\n          `Two segments cannot have the same outlet name: '${p}' and '${c}'.`,\n      );\n    }\n    names[n.value.outlet] = n.value;\n  });\n}\n\nfunction getData(route: Route): Data {\n  return route.data || {};\n}\n\nfunction getResolve(route: Route): ResolveData {\n  return route.resolve || {};\n}\n"]}